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/*
* $Id: barchart.js,v 1.8.2.3 2010/04/06 16:46:11 source Exp $
*
* This file is part of the OpenLink Software Ajax Toolkit (OAT) project.
*
* Copyright (C) 2005-2010 OpenLink Software
*
* See LICENSE file for details.
*/
/*
bc = new OAT.BarChart(div, optObj)
bc.attachData(dataArray)
bc.attachTextX(textArray)
bc.attachTextY(textArray)
bc.draw()
CSS: .legend .legend_box .textX .textY
*/
OAT.BarChart = function(div,optObj) {
var self = this;
this.options = {
percentage:false, /* percentage plot? */
spacing:25, /* between columns */
paddingLeft:30,
paddingBottom:30,
paddingTop:5,
width:15, /* of one column */
colors:["#f00","#0f0","#00f"],
border:true, /* of column */
grid:true, /* show horizontal grid lines */
gridDesc:true, /* description of horizontal grid lines */
gridNum:6, /* approx how many grid lines */
shadow:true,
shadowColor:"#222",
shadowOffset:2
}
for (var p in optObj) { this.options[p] = optObj[p]; }
this.maxValue = 0;
this.data = [];
this.textX = [];
this.textY = [];
this.div = $(div);
OAT.Dom.makePosition(self.div);
this.getFreeH = function() {
var tmp = OAT.Dom.getWH(self.div);
return tmp[1] - self.options.paddingTop - self.options.paddingBottom;
}
this.drawColumn = function(index, position) {
var opts = self.options;
var freeh = self.freeH;
var orig = (typeof(self.data[index]) == "object" ? self.data[index] : [self.data[index]]);
if (opts.percentage) {
var values = [];
var total = 0;
for (var i=0;i<orig.length;i++) { total += orig[i]; }
for (var i=0;i<orig.length;i++) {
values.push(self.maxValue * orig[i] / total);
}
} else { var values = orig; }
/* percentage? */
var bottom = opts.paddingBottom;
var total = 0;
var divs = [];
for (var i=0;i<values.length;i++) {
var v = values[i];
var d = OAT.Dom.create("div",{position:"absolute",fontSize:"0px",lineHeight:"0px"});
if (opts.border) { d.style.border = "1px solid #000"; }
d.style.width = opts.width+"px";
d.style.backgroundColor = opts.colors[i];
d.style.left = position+"px";
d.style.bottom = bottom + "px";
var h = self.scale(v);
d.style.height = h+"px";
bottom += h;
total += h;
divs.push(d);
}
/* shadow */
if (opts.shadow) {
var shadow = OAT.Dom.create("div",{position:"absolute",fontSize:"0px",lineHeight:"0px"});
shadow.style.left = (parseInt(position)+opts.shadowOffset)+"px";
shadow.style.bottom = (opts.paddingBottom+opts.shadowOffset)+"px";
shadow.style.width = opts.width+"px";
shadow.style.height = total + "px";
shadow.style.backgroundColor = opts.shadowColor;
if (opts.border) {
shadow.style.borderColor = opts.shadowColor;
shadow.style.borderWidth = "1px";
shadow.style.borderStyle = "solid";
}
self.div.appendChild(shadow);
}
for (var i=0;i<divs.length;i++) { self.div.appendChild(divs[i]); }
/* text X */
if (self.textX.length) {
var l = OAT.Dom.create("div",{position:"absolute"});
l.className = "textX";
l.innerHTML = self.textX[index];
l.style.top = (freeh + opts.paddingTop + 2) + "px";
l.style.left = position + "px";
self.div.appendChild(l);
var dims = OAT.Dom.getWH(l);
l.style.left = (position +Math.round(opts.width/2) - Math.round(dims[0]/2)) + "px";
}
}
this.draw = function() {
OAT.Dom.clear(self.div);
self.div.style.width = "100%";
if (!self.data.length) { return; }
var position = self.options.paddingLeft;
var width = self.data.length * (self.options.width + self.options.spacing);
self.freeH = self.getFreeH();
/* find maximum */
self.maxValue = 0;
for (var i=0;i<self.data.length;i++) {
if (typeof(self.data[i]) == "object") {
var total = 0;
for (var j=0;j<self.data[i].length;j++) { total += parseFloat(self.data[i][j]); }
if (total > self.maxValue) { self.maxValue = total; }
} else { if ( parseFloat(self.data[i]) > self.maxValue) {self.maxValue = self.data[i];} }
}
/* grid & its description? */
if (self.options.grid) {
/* calculate good values */
var step = (self.options.percentage ? 100 : self.maxValue) / self.options.gridNum;
var base = Math.floor(Math.log(step) / Math.log(10));
var divisor = Math.pow(10,base);
var result = Math.round(step / divisor) * divisor;
for (var i=0;i<=(self.options.percentage ? 100 : self.maxValue);i+=result) {
i = Math.round(i * 1000) / 1000;
var line = OAT.Dom.create("div",{position:"absolute",width:width+"px",height:"1px",fontSize:"0px",lineHeight:"0px",backgroundColor:"#000"});
var scaled = (self.options.percentage ? self.scale(i/100*self.maxValue) : self.scale(i));
var top = self.options.paddingTop + self.freeH - scaled;
line.style.left = position + "px";
line.style.top = top + "px";
self.div.appendChild(line);
if (self.options.gridDesc) {
/* description of Y axis */
var desc = OAT.Dom.create("div",{position:"absolute"});
desc.innerHTML = i;
desc.className = "textY";
desc.style.left = position + "px";
desc.style.top = top + "px";
self.div.appendChild(desc);
var dims = OAT.Dom.getWH(desc);
desc.style.left = (position - 2 - dims[0]) + "px";
desc.style.top = (top - Math.round(dims[1]/2)) + "px";
}
}
}
position += Math.round(self.options.spacing / 2);
for (var i=0;i<self.data.length;i++) {
self.drawColumn(i,position);
position += self.options.width + self.options.spacing;
}
/* legend? */
if (self.textY.length) {
var legend = OAT.Dom.create("div",{position:"absolute"});
legend.className = "legend";
legend.style.left = position + "px";
legend.style.top = self.options.paddingTop + "px";
self.div.appendChild(legend);
for (var i=self.data[0].length-1;i>=0;i--) {
var line = OAT.Dom.create("div",{clear:"left"});
var box = OAT.Dom.create("div");
box.className = "legend_box";
box.style.backgroundColor = self.options.colors[i];
line.appendChild(box);
var value = OAT.Dom.text(self.textY[i]);
line.appendChild(value);
legend.appendChild(line);
}
}
/* resulting total width */
var total = self.options.paddingLeft + self.data.length * (self.options.width + self.options.spacing) + 5;
if (self.textY.length) {
var dims = OAT.Dom.getWH(legend);
total += dims[0]+5+Math.round(self.options.spacing/2);
}
if (!isNaN(total)) { self.div.style.width = total+"px"; }
}
this.scale = function(value) {
return Math.round(value / self.maxValue * self.freeH);
}
this.attachData = function(dataArray) {
self.data = dataArray;
}
this.attachTextX = function(textArray) {
self.textX = textArray;
}
this.attachTextY = function(textArray) {
self.textY = textArray;
}
}
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